Wear-resistant titanium or titanium-alloy member and a method for manufacturing the same
First Claim
1. A method for manufacturing a wear-resistant member, comprising a step of melt-hardening the surface of a member made of a material selected from the group consisting of titanium and titanium alloy, while spraying the member surface with a plasma jet containing, as a working gas, a gas mixture of an inert gas and a hardening gas, thereby providing a Vickers hardness number of 390 to 1,200 and a hardened layer depth of 0.1 to 2.0 mm.
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Abstract
A wear-resistant titanium or titanium-alloy member adapted for use as a poppet valve, rocker arm, etc., of an internal combustion engine, which requires lightness in weight and good wear resistance, and a method for manufacturing the member. The surface of the titanium or titanium-alloy member is given a Vickers hardness number of 390 to 1,200, preferably 400 to 800, and a hardened layer depth of 0.1 to 2.0 mm, preferably 0.3 to 1.5 mm, by being melt-hardened while being supplied with hardening elements.
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Citations
15 Claims
- 1. A method for manufacturing a wear-resistant member, comprising a step of melt-hardening the surface of a member made of a material selected from the group consisting of titanium and titanium alloy, while spraying the member surface with a plasma jet containing, as a working gas, a gas mixture of an inert gas and a hardening gas, thereby providing a Vickers hardness number of 390 to 1,200 and a hardened layer depth of 0.1 to 2.0 mm.
- 10. A method for manufacturing a wear-resistant member, comprising a step of mixing (i) at least one hardening alloy element selected from the group consisting of tin, boron, iron, chromium, nickel, manganese, copper, silicon, silver, tungsten, molybdenum, vanadium, columbium, tantalum, and zirconium, with (ii) at least one compound selected from the group consisting of carbides, nitrides and oxides to form a hardening mixture, and a step of applying said mixture to the surface of a member made of a material selected from the group consisting of titanium and titanium alloy, and a step of melt-hardening said member surface together with said hardening mixture, thereby forming a hardened surface layer on said member having a member surface Vickers hardness number of 390 to 1,200 and a hardened layer depth of 0.1 to 2.0 mm.
- 12. A method for manufacturing a wear-resistant member, comprising a step of applying hardening alloy elements, formed of one or more elements selected from the group consisting of tin, boron, iron, chromium, nickel, manganese, copper, silicon, silver, tungsten, molybdenum, vanadium, columbium, tantalum, and zirconium, to the surface of a member made of a material selected from the group consisting of titanium and titanium alloy, and a step of melt-hardening said member surface together with said hardening alloy elements, while spraying the member surface with a hardening gas, thereby providing a Vickers hardness number of 390 to 1,200 and a hardened layer depth of 0.1 to 2.0 mm.
Specification